Gossamer Forum: General: Perl Programming: Image::Magick showing blank images on some server, but not others?

Oct 17, 2003, 9:22 AM

Andy

Veteran / Moderator (17298 posts)

Oct 17, 2003, 9:22 AM

Post #1 of 7

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Image::Magick showing blank images on some server, but not others?

Hi. Could anyone shed some light on why this code works ok on some server, but on others it shows a blank image? (i.e everything *but* the text)

Its got me baffled :(

TIA

Code:
# this is the routine we will run when creating  
# an Image::Magick image... 
sub gen_Magick { 

     # grab stuff we need... 
      my ($string,$date) = @_; 

     # now we have our 'random' string, and date stuff, lets create the image... 
      use Image::Magick; 

      my $image = Image::Magick->new();  
      print $image->Set( size => "110x50");          
      print $image->ReadImage('xc:white');      
      print $image->Colorize( fill => $BackgroundColor );  
      print $image->Border( width => 5, height => 5, fill => $BorderColor );      

      # only do these things if the user has decided to... 
      if ($DoRaise) { 
        print $image->Raise( width => 5, height => 5, raise => 'True' );  
      } 

      # only do these things if the user has decided to... 
      if ($DoWave) { 
        print $image->Wave( amplitude => 5, wavelength => 30 );    
      } 

     # decide a random font to use... 
      my @fonts = ('Charter','Arial'); 
      my @number= (0..2); 
      my $rand  = int(rand scalar(@number)); 
      my $font = $fonts[$rand]; #"Charter";  

     # annotate the image, so we have our string they need to enter... 
      $image->Annotate( 
        text     => $string, 
        fill     => $TextColor,  
        x        => 15, 
        y        => 30,  
        pointsize=> 15,  
        font     => $font); 


     # setup some paths/urls etc... 
      my $path = $CFG->{build_root_path} . "/AddImages/" . $date . ".gif"; 
      my $url  = $CFG->{build_root_url}; 

      print $image->Write($path); 
      undef $image;     

     # pass stuff back into our templates.... 
      $IN->param( SessionDate => $date ); 
      $IN->param( ImageURL => "$url/AddImages/$date.gif" ); 

} 

1;

Cheers

Andy (mod)
andy@ultranerds.co.uk

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Oct 17, 2003, 10:10 AM

Wil

Veteran / Moderator (4108 posts)

Oct 17, 2003, 10:10 AM

Post #2 of 7

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Re: [Andy] Image::Magick showing blank images on some server, but not others? In reply to

Take advantage of Image Magick's built in error reporting. You should change every function to read something like:

Code:
    my $x; 

    $x = $image->Write(filename=>"$writeimage");  
    die $x if $x

Do that for every function and then just look up in your error.log for the error message which is usually very intuitive.

- wil

Last edited by:

Wil: Oct 17, 2003, 10:11 AM

Oct 17, 2003, 10:13 AM

Andy

Veteran / Moderator (17298 posts)

Oct 17, 2003, 10:13 AM

Post #3 of 7

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Re: [Wil] Image::Magick showing blank images on some server, but not others? In reply to

That never worked for me before, but I'll give it a go again, and see if that uncovers anything :)

Cheers

Andy (mod)
andy@ultranerds.co.uk

Oct 23, 2003, 7:10 AM

Andy

Veteran / Moderator (17298 posts)

Oct 23, 2003, 7:10 AM

Post #4 of 7

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Re: [Andy] Image::Magick showing blank images on some server, but not others? In reply to

Managed to track it down to this line;

Code:
print $image->Set(size=>'110x50') || die &error($! . __LINE__);

That is line 14, in the full routine below;

Code:
# this is the routine we will run when creating  
# an Image::Magick image... 
sub gen_Magick { 

     # grab stuff we need... 
      my ($string,$date) = @_; 

     # now we have our 'random' string, and date stuff, lets create the image... 
      use Image::Magick; 

      my $image = Image::Magick->new();  
print $image->Set(size=>'110x50') || die &error($! . __LINE__);
      print $image->ReadImage('xc:white') || die &error($! . __LINE__);      
      print $image->Colorize( fill => $BackgroundColor ) || die &error($! . __LINE__);  
      print $image->Border( width => 5, height => 5, fill => $BorderColor ) || die &error($! . __LINE__);      

      # only do these things if the user has decided to... 
      if ($DoRaise) { 
        print $image->Raise( width => 5, height => 5, raise => 'True' ) || die &error($! . __LINE__);  
      } 

      # only do these things if the user has decided to... 
      if ($DoWave) { 
        print $image->Wave( amplitude => 5, wavelength => 30 ) || die &error($! . __LINE__);    
      } 

     # decide a random font to use... 
      my @fonts = ('Charter','Arial'); 
      my @number= (0..2); 
      my $rand  = int(rand scalar(@number)); 
      my $font = $fonts[$rand]; #"Charter";  

     # annotate the image, so we have our string they need to enter... 
      print $image->Annotate( 
        text     => $string, 
        fill     => $TextColor,  
        x        => 15, 
        y        => 30,  
        pointsize=> 15,  
        font     => $font) || die &error($! . __LINE__); 


     # setup some paths/urls etc... 
      my $path = $CFG->{build_root_path} . "/AddImages/" . $date . ".gif"; 
      my $url  = $CFG->{build_root_url}; 

      print $image->Write($path) || die &error($! . __LINE__); 
      undef $image;     

     # pass stuff back into our templates.... 
      $IN->param( SessionDate => $date ); 
      $IN->param( ImageURL => "$url/AddImages/$date.gif" ); 

} 

sub error { 

  my $error = $_[0]; 

  print $IN->header(); 
  print "An error occured. It was: $error"; 
  exit; 

} 

1;